摘要
地埋管换热器传热性能及传热过程的研究一直是地源热泵工程应用的理论基础和重点。结合河南某地地源热泵工程,针对不同埋管方式的垂直U型地埋管建立现场热响应试验系统,分析得到场地土壤等效导热系数为1.52 W/(K·m);双U型(每个钻孔中埋设两组U型管)地埋管换热器的换热效果比单U型管高30%左右,De32(公称外径为32 mm)型双U地埋管的延米(单位管长)换热量比De25型高约10%,地埋管延米换热量随载热流体流速的变化不呈正相关变化,存在最优流速使得换热器换热效果最好;以单位钻孔深度换热量最大作为优化条件提出优化U型地埋管换热器设计的方法,建议设计前试验确定适合管径和流体最优流速。
The study on heat transfer process and capacity of the underground heat exchanger is the engineering application＇ s theoretical foundation and focal point. The GSHP project used by a high-speed railway station is combined. Thermal response test is established on the spot based on different mode of underground heat exchanger. The effective thermal conductivity is 1.52 W/（ K·m）. The two U-tube ground heat exchanger＇ s heat transfer performance is much better than the one U-tubes ground heat exchanger. In addition, The heat transfer performance of De32 ground heat exchanger is about 10% higher than the De25. The ground heat exchanger＇ s heat transfer performance isn＇ t positively correlated with the changes in fluid flow rate. It will get best heat transfer performance if the U-pipe size diameter is proper or the fluid flow rate is optimal.
出处
《科学技术与工程》
北大核心
2013年第24期7271-7274,共4页
Science Technology and Engineering
关键词
U型地埋管
热响应试验
传热性能
最优流速
优化设计
U-tube ground heat exchanger
thermal response test
heat transfer performance
fluid flow rate
optimization design
